Base plate for fastening a rail to a fixed bottom support, and fastener for a rail

Abstract

The invention provides a base plate, and a fastener equipped with such a base plate, whose weight is minimized and whose stiffness is optimised on the one hand and which is suitable for being supported on an elastic intermediate layer on the other hand. To this end, a base plate according to the invention for fastening a rail to a fixed bottom support has, the base plate being made of a plastics material and a stiffening structure which is formed by ribs and by depressions present between the ribs being formed or molded in the underside of the base plate, which underside is associated with the fixed bottom support, depressions of the stiffening structure being closed off, in accordance with the invention, by a filling material.

The invention claimed is: 
     
       1. A fastener for fastening a rail to a fixed bottom support comprising a base plate and an intermediate layer of an elastic material arranged between the base plate and the fixed bottom support, wherein the base plate comprises a plastics material and a stiffening structure which is formed by ribs and by depressions present between the ribs being formed or moulded in an underside of the base plate, wherein the underside is associated with the fixed bottom support, wherein the depressions of the stiffening structure are closed off by a filling material. 
     
     
       2. The fastener according to  claim 1 , wherein the filling material completely fills the depressions of the stiffening structure. 
     
     
       3. The fastener according to  claim 1 , wherein the filling material has sound-damping properties. 
     
     
       4. The fastener according to  claim 1 , wherein there is present on an upper side of the base plate, a supporting surface for the rail which is to be fastened in place, wherein the supporting surface is bounded by respective supporting shoulders at longitudinal sides of the supporting surface which are aligned in a longitudinal direction of the rail which is to be fastened in place. 
     
     
       5. The fastener according to  claim 4 , wherein respective clamping members for bracing a resilient member can be fastened to the supporting shoulders, the resilient member intended to hold down the rail to be fastened in place. 
     
     
       6. The fastener according to  claim 5 , wherein a through-opening which runs from the upper side of the base plate to the underside of the base plate is formed or moulded in the given supporting shoulder to allow the clamping member to be fastened in place. 
     
     
       7. The fastener according to  claim 6 , wherein the clamping member is a clamping bolt having a polygonal head with side faces and, wherein a receptacle is formed or moulded in the underside of the base plate around the perimeter of the through-opening, wherein the receptacle comprises a circumferential side wall having contact faces formed thereon and associated with each side-face of the bolt head, wherein each contact face extends partially the length of an associated bolt head side-face, such that in an installed state, the contact faces provide planar support against the bolt head side-faces, wherein the contact faces of the circumferential wall are arranged to be spaced apart from one another such that recesses are formed or moulded in the circumferential wall of the receptacle, between directly adjacent contact faces, and wherein, at a first recess, there is no contact between the bolt head and the circumferential wall of the receptacle in the fully installed state. 
     
     
       8. The fastener according to  claim 4 , wherein the base plate has a constriction in the region of the supporting surface. 
     
     
       9. The fastener according to  claim 1 , wherein there is formed on the underside of the base plate at least one projection which points away from the underside and which acts as a stop. 
     
     
       10. The fastener according to  claim 1 , wherein the base plate has at least one opening, which runs from an upper side of the base plate to an underside of the base plate, for a hold-down sleeve having a circumferential surface, wherein the hold-down sleeve has a projection protruding from the circumferential surface which bears against the upper side of the base plate in a fully installed state. 
     
     
       11. The fastener according to  claim 10 , wherein the hold-down sleeve takes the form of an eccentric sleeve and, wherein there are formed, in the opening for the sleeve, markers for indexing which are arranged at a spacing from one another such that, allowing for the eccentricity of an axis of rotation of the eccentric sleeve from a central longitudinal axis of the opening for the sleeve, the markers for indexing define positions in rotation of the eccentric sleeve if the eccentric sleeve is adjusted in rotation about the axis of rotation in the opening for the sleeve, which positions in rotation correspond to a step-by-step change in the position of the base plate by a defined amount. 
     
     
       12. The fastener according to  claim 1 , wherein the base plate has at least one opening, which runs from an upper side of the base plate to an underside of the base plate, for a hold-down sleeve having a circumferential surface, which hold-down sleeve has a projection protruding from the circumferential surface which bears against the upper side of the base plate in a fully installed state, which hold-down sleeve can be inserted from the upper side of the base plate through the opening for a sleeve associated with the opening in the base plate as a sliding fit, the height of which hold-down sleeve is greater than a thickness of the base plate in a region of the opening for a sleeve associated with the opening, and which hold-down sleeve has a projection protruding from its circumferential surface which bears against the upper side of the base plate in the fully installed state, and wherein a fastening member which can be inserted through the opening of the hold-down sleeve is intended to fasten the hold-down sleeve to the fixed bottom support. 
     
     
       13. The fastener according to  claim 12 , wherein the base plate has at least one opening, which runs from an upper side of the base plate to an underside of the base plate, for a hold-down sleeve having a circumferential surface, which hold-down sleeve has a projection protruding from the circumferential surface which bears against the upper side of the base plate in a fully installed state, wherein the hold-down sleeve takes the form of an eccentric sleeve and, wherein there are formed, in the opening for the sleeve, markers for indexing which are arranged at a spacing from one another such that, allowing for the eccentricity of an axis of rotation of the eccentric sleeve from a central longitudinal axis of the opening for the sleeve, the markers for indexing define positions in rotation of the eccentric sleeve if the eccentric sleeve is adjusted in rotation about the axis of rotation in the opening for the sleeve, which positions in rotation correspond to a step-by-step change in the position of the base plate by a defined amount, and wherein the hold-down sleeve has a shaped member corresponding to the markers for indexing in the opening for the sleeve by means of which shaped member the hold-down sleeve inserted in the opening for a sleeve associated with the said hold-down sleeve is coupled by positive-fit to a given one of the markers for indexing in the opening for the sleeve. 
     
     
       14. The fastener according to  claim 1 , wherein a carrier plate is arranged between the elastic intermediate layer and the fixed bottom support.